High Temperature Electrolysis in Alkaline Cells, Solid Proton Conducting Cells, and Solid Oxide Cells

Ebbesen, Sune Dalgaard; Jensen, Søren Højgaard; Hauch, Anne; Mogensen, Mogens Bjerg

doi:10.1021/cr5000865

Cited by 519 publications

(410 citation statements)

References 574 publications

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“…One example highlighting the correlation between measured impedance and corresponding processes at the interface 7 is given in Figure 3a. Since IS can be carried out in situ and in operando, this technique has provided invaluable insight into SOC interface processes over the years 8,9 .…”

Section: Characterization and Modelling Of The Interfacementioning

confidence: 99%

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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Section: Characterization and Modelling Of The Interfacementioning

confidence: 99%

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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“…from wind turbines via hydrogen production (when SOEC are used for electrolysis of H2O) or for syn-gas production (when SOEC are used for electrolysis of CO2 + H2O) and subsequent synthetic natural gas production or production of other synthetic fuels. The SOEC technology offers the most efficient electrolysis technology for conversion of electrical energy and the possibility for syn-gas production [1] or even direct methane production at lower temperature and pressurized operation [2]. However, for a commercial break-through for the SOEC technology not only high initial performance is required, but also long-term stability preferably in a large range of operating conditions (temperature, gas compositions, current densities etc.)…”

Section: Introductionmentioning

confidence: 99%

Ni/YSZ electrodes structures optimized for increased electrolysis performance and durability

et al. 2016

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Cermet Ni/YSZ electrodes are the most commonly applied fuel electrode for solid oxide cells (SOC) both when targeting solid oxide fuel cell (SOFC) applications and when used as solid oxide electrolysis cell (SOEC). In this work we report on the correlation between initial Ni/YSZ microstructure and the resulting electrochemical performance both initially and during long-term electrolysis testing at high current density and high p(H2O) inlet. Especially, this work focuses on microstructure optimization to hinder Ni mobility and migration during long-term operation and illustrates the key-role of electrode over-potential on the degradation of the Ni/YSZ electrodes in SOEC. We find that for long-term stability for electrolysis at high current densities and high p(H2O) the as-produced NiO/YSZ precursor electrode should be: 1) As dense as possible, 2) as fine particle and pore sized as possible and 3) the three phases (Ni, YSZ and pore phase) shall be size-matched and welldispersed. Applying such microstructure optimized Ni/YSZ electrode we show SOEC test results with long-term degradation rate as low as 0.3-0.4 %/kh at 1 A/cm 2 , 800 C and inlet gas mixture of p(H2O)/p(H2):90/10. This enables SOEC operation of such cell for more than 5 years below thermo-neutral potential at these operating conditions.

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“…However, over long-term operation, a SOEC degrades faster than a SOFC [26]. Degradation mainly occurs at the anode; high produced oxygen partial pressure occurs at the electrode/electrolyte interface, which causes the electrode to delaminate, although this can be limited when the current density is low 1 A cm −2 [27]. SOEC studies have focused on improving stability at a high current density.…”

Section: Brief Explanations Of Soecmentioning

confidence: 99%

Analysis of Trends and Emerging Technologies in Water Electrolysis Research Based on a Computational Method: A Comparison with Fuel Cell Research

2018

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Abstract:Water electrolysis for hydrogen production has received increasing attention, especially for accumulating renewable energy. Here, we comprehensively reviewed all water electrolysis research areas through computational analysis, using a citation network to objectively detect emerging technologies and provide interdisciplinary data for forecasting trends. The results show that all research areas increase their publication counts per year, and the following two areas are particularly increasing in terms of number of publications: "microbial electrolysis" and "catalysts in an alkaline water electrolyzer (AWE) and in a polymer electrolyte membrane water electrolyzer (PEME).". Other research areas, such as AWE and PEME systems, solid oxide electrolysis, and the whole renewable energy system, have recently received several review papers, although papers that focus on specific technologies and are cited frequently have not been published within the citation network. This indicates that these areas receive attention, but there are no novel technologies that are the center of the citation network. Emerging technologies detected within these research areas are presented in this review. Furthermore, a comparison with fuel cell research is conducted because water electrolysis is the reverse reaction to fuel cells, and similar technologies are employed in both areas. Technologies that are not transferred between fuel cells and water electrolysis are introduced, and future water electrolysis trends are discussed.

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High Temperature Electrolysis in Alkaline Cells, Solid Proton Conducting Cells, and Solid Oxide Cells

Cited by 519 publications

References 574 publications

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Ni/YSZ electrodes structures optimized for increased electrolysis performance and durability

Analysis of Trends and Emerging Technologies in Water Electrolysis Research Based on a Computational Method: A Comparison with Fuel Cell Research

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